(19)
(11) EP 1 517 025 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.05.2009 Bulletin 2009/21

(43) Date of publication A2:
23.03.2005 Bulletin 2005/12

(21) Application number: 04020166.7

(22) Date of filing: 25.08.2004
(51) International Patent Classification (IPC): 
F01N 3/021(2006.01)
F02D 41/40(2006.01)
F01N 3/023(2006.01)
 F02D 41/02(2006.01)
F01N 9/00(2006.01)
B01D 53/04(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 17.09.2003 JP 2003325034

(71) Applicant: NISSAN MOTOR CO., LTD.
Yokohama-shi, Kanagawa (JP)

(72) Inventors:
  • Inoue, Takao
    Yokohama-shi Kanagawa 233-0002 (JP)
  • Kawashima, Junichi
    Yokosuka-shi Kanagawa 239-0835 (JP)
  • Tsutsumoto, Naoya
    Yokohama-shi Kanagawa 222-0032 (JP)
  • Otake, Makoto
    Yokohama-shi Kanagawa 241-0014 (JP)
  • Kondou, Terunori
    Yokohama-shi Kanagawa 221-0001 (JP)
  • Ueono, Shouichirou
    Yokohama-shi Kanagawa 221-0001 (JP)
  • Koga, Toshimasa
    Yokohama-shi Kanagawa 221-0001 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Diesel engine comprising particle filter and method of estimating amount of particles trapped in particle filter


(57) A filter differential pressure, which is the difference between the inlet pressure and the outlet pressure of a DPM filter (11), is determined, and switching is performed in accordance with the regeneration condition of the DPM filter (11) between a first trapped DPM amount calculation process for estimating the trapped DPM amount after complete regeneration, in which all of the DPM trapped in the DPM filter (11) is burned, and a second trapped DPM amount calculation process for estimating the trapped DPM amount when a part of the DPM trapped in the DPM filter (11) has been burned away. The trapped DPM amount in the DPM filter (11) is estimated on the basis of the filter differential pressure using one of the first and second trapped DPM amount calculation processes.







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